Improved sensitivity of interferometric gravitationalwave detectors to ultralight vector dark matter from the finite lighttraveling time
Abstract
Recently, several studies have pointed out that gravitationalwave detectors are sensitive to ultralight vector dark matter and can improve the current best constraints given by the equivalence principle tests. While a gravitationalwave detector is a highly precise measuring tool for the length difference of its arms, its sensitivity is limited because the displacements of its test mass mirrors caused by vector dark matter are almost common. In this paper, we point out that the sensitivity is significantly improved if the effect of finite lighttraveling time in the detector's arms is taken into account. This effect enables advanced LIGO to improve the constraints on the U (1 )_{B L} gauge coupling by an order of magnitude compared with the current best constraints. It also makes the sensitivities of the future gravitationalwave detectors overwhelmingly better than the current ones. The factor by which the constraints are improved due to the new effect depends on the mass of the vector dark matter, and the maximum improvement factors are 470, 880, 1600, 180, and 1400 for advanced LIGO, Einstein Telescope, Cosmic Explorer, DECIGO, and LISA, respectively. Including the new effect, we update the constraints given by the first observing run of advanced LIGO and improve the constraints on the U (1 )_{B} gauge coupling by an order of magnitude compared with the current best constraints.
 Publication:

Physical Review D
 Pub Date:
 March 2021
 DOI:
 10.1103/PhysRevD.103.L051702
 arXiv:
 arXiv:2011.03589
 Bibcode:
 2021PhRvD.103e1702M
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  High Energy Astrophysical Phenomena;
 General Relativity and Quantum Cosmology
 EPrint:
 6 pages, 3 figures